I would be on board for such a project. Integrating fencing or specifically dueling rules would be a big plus for me. Mass combat rules would have be pretty abstract to fit in with BRP but it would be interesting to see it done.
This type of background has been visited before in both historical (Flashing Blades, Lace & Steel, various Pirates/Musketeer games) and more fantastic (Pirates of the Caribbean, Flintloque (
to give a bad example)) flavors.